单项选择题

______ on a clear day far from the city crowds, the mountains give him a sense of peace.

A．If walking
B．While walking
C．Walking
D．When one is walking
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单项选择题
______ her words were spoken, there was no mistaking that she was pleased.
A．Gently as
B．As gently
C．As gently as
D．So gently as
单项选择题
Human beings are superior to animals______they can use language as a tool to communicate.
A．like
B．while
C．when
D．for
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